Fill in the blanks with suitable to infinitives

1) It is harmful _____.
2) ____ is wrong.
3) I like ____ cricket.
4) It is too easy ____ this sum.
5) He used ____ in Delhi.
6) The train is about ____.
7) He is too weak ____.
8) It is impossible ____ its writing.
9) She stood up ____ a question.
10) She taught me how ____ this sum.